Like the above person (or maybe a couple above me now), I also used the free event version for the jam. While I won't be finishing or refining my game *after* the jam, I did spend as much time as I could after submissions closed (and before the free event version of MZ expired) to do just that! It was only an extra week, but I think I was able to get in the rest of the content my partner and I had planned for the game, as well as give the game a much needed touch-up. It's still a super-short game, but I'm a lot happier with it now than I was when I originally submitted it. Like you, I also plan on uploading this updated version later. In any case, I don't plan on updating it anymore even if I do purchase a copy of MZ later.